Add some plumbing for the color management of canvases

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 186 matching lines @@
     int getFontBaseline(const FontMetrics&) const;
 
     void drawFocusIfNeededInternal(const Path&, Element*);
     bool focusRingCallIsValid(const Path&, Element*);
     void drawFocusRing(const Path&);
     void updateElementAccessibility(const Path&, Element*);
 
     CanvasRenderingContext::ContextType getContextType() const override { return CanvasRenderingContext::Context2d; }
     bool is2d() const override { return true; }
     bool isAccelerated() const override;
-    bool hasAlpha() const override { return m_hasAlpha; }
+    bool hasAlpha() const override { return creationAttributes().alpha(); }
     void setIsHidden(bool) override;
     void stop() final;
     DECLARE_VIRTUAL_TRACE();
 
     virtual bool isTransformInvertible() const;
 
     WebLayer* platformLayer() const override;
 
     Member<HitRegionManager> m_hitRegionManager;
-    bool m_hasAlpha;
     LostContextMode m_contextLostMode;
     bool m_contextRestorable;
     unsigned m_tryRestoreContextAttemptCount;
     Timer<CanvasRenderingContext2D> m_dispatchContextLostEventTimer;
     Timer<CanvasRenderingContext2D> m_dispatchContextRestoredEventTimer;
     Timer<CanvasRenderingContext2D> m_tryRestoreContextEventTimer;
 
     HashMap<String, Font> m_fontsResolvedUsingCurrentStyle;
     bool m_pruneLocalFontCacheScheduled;
     ListHashSet<String> m_fontLRUList;
 
     bool isPaintable() const final
     {
         NOTREACHED();
         return false;
     }
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context,
     context->is2d() && context->canvas(), context.is2d() && context.canvas());
 
 } // namespace blink
 
 #endif // CanvasRenderingContext2D_h